Hornberg Castle was probably originally built in the late 12th century. The first mention of the castle dates from 1184. In 1259 lords of Hornberg sold the castle to the bishop of Speyer. Since 1612 it has been owned by the 12th generations of Gemmingen barons. Today the castle is a hotel.
Hornberg originally consisted of two separate castles. Between them was a bailey. Around 1510, both castles were enclosed together with the a common wall as an additional attachment of Conz Schott of Schottenstein.
Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.